feat(home): implement sorting functionality for coin list

[00fanxi]

관련 이슈

• Closes #

사전 점검

• ./gradlew spotlessApply 실행을 완료하였습니다.

작업 개요

1. SortHeaderItem.kt에서 SortHeaderItem의 텍스트 사이즈를 14 -> 12로 변경하였습니다.
2. HomeContract.kt에서 enum class SortField를 추가하였습니다.
3. HomeContract.kt에서 data class HomeUiState에 sortField와 sortDirection을 추가하였습니다.
4. HomeContract.kt에서 sealed interface HomeEvent에 OnSortClicked를 추가하였습니다.
5. HomeViewModel.kt에서 observeCoins 함수에서 먼저 sortCoins를 진행하도록 하였습니다.
6. HomeViewModel.kt에서 updateSort와 sortCoins 함수를 추가하였습니다.
7. HomeViewModel.kt에서 toggleDirection과 defaultSortDirection 함수를 추가하였습니다.
8. HomeViewModel.kt에서 handleEvent에 HomeEvent.OnSortClicked 발생시 updateSort를 진행하도록 하였습니다.
9. HomeScreen.kt에서 SortHeader의 onSymbolClick, onPriceClick, onChangeClick에 이벤트를 연결하고, 각 Sort Ui를 업데이트도 업데이트 하도록 만들었습니다.

상세 내용

1️⃣ UI/UX 변경

Before	After

2️⃣ 로직 및 아키텍처

• 기존 방식:
• 변경 방식:

구분	AS-IS (기존)	TO-BE (변경)
		정렬 기능 추가

3️⃣ 리팩토링

리뷰어 집중 포인트(참고 사항)

후속 작업

• [ ]

[Copilot]

Pull request overview

Implements interactive sorting for the home coin list and aligns the sort header UI with the new behavior.

Changes:

• Home state/contract: adds sortField, sortDirection, and OnSortClicked to HomeUiState/HomeEvent so sorting can be driven from the ViewModel.
• ViewModel logic: wires OnSortClicked into HomeViewModel, introduces sortCoins, and ensures incoming coin data is always sorted according to the current sort field/direction.
• UI wiring: connects SortHeader in HomeScreen to the new sort state and events, and adjusts SortHeaderItem text size for the sort header labels.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
home/presentation/src/main/java/io/soma/cryptobook/home/presentation/component/sortheader/SortHeaderItem.kt	Adjusts sort header label text size (14sp → 12sp) to match updated design.
home/presentation/src/main/java/io/soma/cryptobook/home/presentation/HomeViewModel.kt	Adds sort handling (OnSortClicked, updateSort, sortCoins, default/toggle direction) and applies sorting to observed coin lists.
home/presentation/src/main/java/io/soma/cryptobook/home/presentation/HomeScreen.kt	Binds sort state from HomeUiState into SortHeader and dispatches OnSortClicked events on header clicks.
home/presentation/src/main/java/io/soma/cryptobook/home/presentation/HomeContract.kt	Extends HomeUiState with sort-related fields, introduces SortField enum, and adds OnSortClicked event.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

This if/else branch uses a }else{ style that differs from the rest of the Kotlin codebase, which consistently uses spaces (} else {, e.g. core/network/src/main/java/io/soma/cryptobook/core/network/base/BaseDataSource.kt:38). For consistency with established formatting conventions (and to keep tools like Spotless/ktlint happy), please add spaces around else here.

[Copilot]

HomeUiState now exposes sortDirection using SortDirection from the component.sortheader package, which couples the screen contract to a specific UI component implementation. In other screens (e.g. coin-detail/presentation/src/main/java/io/soma/cryptobook/coindetail/presentation/CoinDetailContract.kt), UI state types stay independent of leaf UI components, so it would be more consistent and maintainable to define SortDirection alongside HomeUiState (or in a shared presentation package) and let SortHeader/SortHeaderItem depend on that instead.

[helpingstar]

lineHeight = 20.sp 이기 때문에 fontSize를 바꾸는 것은 의미가 없습니다. 바꾼 이유가 있을까요?

[00fanxi]

24h change % 부분이 가로로 길이가 초과되서요

[acious]

명시적으로 넣는거보다 state.sortField를 인자로 넣어도 되겠네요